VeraCrypt
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path: root/src/Volume/VolumeHeader.cpp
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/*
  zip_memdup.c -- internal zip function, "strdup" with len
  Copyright (C) 1999-2021 Dieter Baron and Thomas Klausner

  This file is part of libzip, a library to manipulate ZIP archives.
  The authors can be contacted at <info@libzip.org>

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in
     the documentation and/or other materials provided with the
     distribution.
  3. The names of the authors may not be used to endorse or promote
     products derived from this software without specific prior
     written permission.

  THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <stdlib.h>
#include <string.h>

#include "zipint.h"


void *
_zip_memdup(const void *mem, size_t len, zip_error_t *error) {
    void *ret;

    if (len == 0)
        return NULL;

    ret = malloc(len);
    if (!ret) {
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return NULL;
    }

    (void)memcpy_s(ret, len, mem, len);

    return ret;
}
347' href='#n347'>347 348 349 350 351 352 353 354 355 356 357 358 359 360
/*
 Derived from source code of TrueCrypt 7.1a, which is
 Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
 by the TrueCrypt License 3.0.

 Modifications and additions to the original source code (contained in this file)
 and all other portions of this file are Copyright (c) 2013-2017 IDRIX
 and are governed by the Apache License 2.0 the full text of which is
 contained in the file License.txt included in VeraCrypt binary and source
 code distribution packages.
*/

#include "Crc32.h"
#include "EncryptionModeXTS.h"
#include "Pkcs5Kdf.h"
#include "Pkcs5Kdf.h"
#include "VolumeHeader.h"
#include "VolumeException.h"
#include "Common/Crypto.h"

namespace VeraCrypt
{
	VolumeHeader::VolumeHeader (uint32 size)
	{
		Init();
		HeaderSize = size;
		EncryptedHeaderDataSize = size - EncryptedHeaderDataOffset;
	}

	VolumeHeader::~VolumeHeader ()
	{
		Init();
	}

	void VolumeHeader::Init ()
	{
		VolumeKeyAreaCrc32 = 0;
		VolumeCreationTime = 0;
		HeaderCreationTime = 0;
		mVolumeType = VolumeType::Unknown;
		HiddenVolumeDataSize = 0;
		VolumeDataSize = 0;
		EncryptedAreaStart = 0;
		EncryptedAreaLength = 0;
		Flags = 0;
		SectorSize = 0;
	}

	void VolumeHeader::Create (const BufferPtr &headerBuffer, VolumeHeaderCreationOptions &options)
	{
		if (options.DataKey.Size() != options.EA->GetKeySize() * 2 || options.Salt.Size() != GetSaltSize())
			throw ParameterIncorrect (SRC_POS);

		headerBuffer.Zero();

		HeaderVersion = CurrentHeaderVersion;
		RequiredMinProgramVersion = CurrentRequiredMinProgramVersion;

		DataAreaKey.Zero();
		DataAreaKey.CopyFrom (options.DataKey);

		VolumeCreationTime = 0;
		HiddenVolumeDataSize = (options.Type == VolumeType::Hidden ? options.VolumeDataSize : 0);
		VolumeDataSize = options.VolumeDataSize;

		EncryptedAreaStart = options.VolumeDataStart;
		EncryptedAreaLength = options.VolumeDataSize;

		SectorSize = options.SectorSize;

		if (SectorSize < TC_MIN_VOLUME_SECTOR_SIZE
			|| SectorSize > TC_MAX_VOLUME_SECTOR_SIZE
			|| SectorSize % ENCRYPTION_DATA_UNIT_SIZE != 0)
		{
			throw ParameterIncorrect (SRC_POS);
		}

		EA = options.EA;
		shared_ptr <EncryptionMode> mode (new EncryptionModeXTS ());
		EA->SetMode (mode);

		EncryptNew (headerBuffer, options.Salt, options.HeaderKey, options.Kdf);
	}

	bool VolumeHeader::Decrypt (const ConstBufferPtr &encryptedData, const VolumePassword &password, int pim, shared_ptr <Pkcs5Kdf> kdf, bool truecryptMode, const Pkcs5KdfList &keyDerivationFunctions, const EncryptionAlgorithmList &encryptionAlgorithms, const EncryptionModeList &encryptionModes)
	{
		if (password.Size() < 1)
			throw PasswordEmpty (SRC_POS);

		ConstBufferPtr salt (encryptedData.GetRange (SaltOffset, SaltSize));
		SecureBuffer header (EncryptedHeaderDataSize);
		SecureBuffer headerKey (GetLargestSerializedKeySize());

		foreach (shared_ptr <Pkcs5Kdf> pkcs5, keyDerivationFunctions)
		{
			if (kdf && (kdf->GetName() != pkcs5->GetName()))
				continue;

			pkcs5->DeriveKey (headerKey, password, pim, salt);

			foreach (shared_ptr <EncryptionMode> mode, encryptionModes)
			{
				if (typeid (*mode) != typeid (EncryptionModeXTS))
					mode->SetKey (headerKey.GetRange (0, mode->GetKeySize()));

				foreach (shared_ptr <EncryptionAlgorithm> ea, encryptionAlgorithms)
				{
					if (!ea->IsModeSupported (mode))
						continue;

					if (typeid (*mode) == typeid (EncryptionModeXTS))
					{
						ea->SetKey (headerKey.GetRange (0, ea->GetKeySize()));

						mode = mode->GetNew();
						mode->SetKey (headerKey.GetRange (ea->GetKeySize(), ea->GetKeySize()));
					}
					else
					{
						ea->SetKey (headerKey.GetRange (LegacyEncryptionModeKeyAreaSize, ea->GetKeySize()));
					}

					ea->SetMode (mode);

					header.CopyFrom (encryptedData.GetRange (EncryptedHeaderDataOffset, EncryptedHeaderDataSize));
					ea->Decrypt (header);

					if (Deserialize (header, ea, mode, truecryptMode))
					{
						EA = ea;
						Pkcs5 = pkcs5;
						return true;
					}
				}
			}
		}

		return false;
	}

	bool VolumeHeader::Deserialize (const ConstBufferPtr &header, shared_ptr <EncryptionAlgorithm> &ea, shared_ptr <EncryptionMode> &mode, bool truecryptMode)
	{
		if (header.Size() != EncryptedHeaderDataSize)
			throw ParameterIncorrect (SRC_POS);

		if (truecryptMode && (header[0] != 'T' ||
			header[1] != 'R' ||
			header[2] != 'U' ||
			header[3] != 'E'))
			return false;

		if (!truecryptMode && (header[0] != 'V' ||
			header[1] != 'E' ||
			header[2] != 'R' ||
			header[3] != 'A'))
			return false;

		size_t offset = 4;
		HeaderVersion =	DeserializeEntry <uint16> (header, offset);

		if (HeaderVersion < MinAllowedHeaderVersion)
			return false;

		if (HeaderVersion > CurrentHeaderVersion)
			throw HigherVersionRequired (SRC_POS);

		if (HeaderVersion >= 4
			&& Crc32::ProcessBuffer (header.GetRange (0, TC_HEADER_OFFSET_HEADER_CRC - TC_HEADER_OFFSET_MAGIC))
			!= DeserializeEntryAt <uint32> (header, TC_HEADER_OFFSET_HEADER_CRC - TC_HEADER_OFFSET_MAGIC))
		{
			return false;
		}

		RequiredMinProgramVersion = DeserializeEntry <uint16> (header, offset);

		if (!truecryptMode && (RequiredMinProgramVersion > Version::Number()))
			throw HigherVersionRequired (SRC_POS);

		if (truecryptMode)
		{
			if (RequiredMinProgramVersion < 0x600 || RequiredMinProgramVersion > 0x71a)
				throw UnsupportedTrueCryptFormat (SRC_POS);
			RequiredMinProgramVersion = CurrentRequiredMinProgramVersion;
		}

		VolumeKeyAreaCrc32 = DeserializeEntry <uint32> (header, offset);
		VolumeCreationTime = DeserializeEntry <uint64> (header, offset);
		HeaderCreationTime = DeserializeEntry <uint64> (header, offset);
		HiddenVolumeDataSize = DeserializeEntry <uint64> (header, offset);
		mVolumeType = (HiddenVolumeDataSize != 0 ? VolumeType::Hidden : VolumeType::Normal);
		VolumeDataSize = DeserializeEntry <uint64> (header, offset);
		EncryptedAreaStart = DeserializeEntry <uint64> (header, offset);
		EncryptedAreaLength = DeserializeEntry <uint64> (header, offset);
		Flags = DeserializeEntry <uint32> (header, offset);

		SectorSize = DeserializeEntry <uint32> (header, offset);
		if (HeaderVersion < 5)
			SectorSize = TC_SECTOR_SIZE_LEGACY;

		if (SectorSize < TC_MIN_VOLUME_SECTOR_SIZE
			|| SectorSize > TC_MAX_VOLUME_SECTOR_SIZE
			|| SectorSize % ENCRYPTION_DATA_UNIT_SIZE != 0)
		{
			throw ParameterIncorrect (SRC_POS);
		}

#if !(defined (TC_WINDOWS) || defined (TC_LINUX) || defined (TC_MACOSX))
		if (SectorSize != TC_SECTOR_SIZE_LEGACY)
			throw UnsupportedSectorSize (SRC_POS);
#endif

		offset = DataAreaKeyOffset;

		if (VolumeKeyAreaCrc32 != Crc32::ProcessBuffer (header.GetRange (offset, DataKeyAreaMaxSize)))
			return false;

		DataAreaKey.CopyFrom (header.GetRange (offset, DataKeyAreaMaxSize));

		ea = ea->GetNew();
		mode = mode->GetNew();

		if (typeid (*mode) == typeid (EncryptionModeXTS))
		{
			ea->SetKey (header.GetRange (offset, ea->GetKeySize()));
			mode->SetKey (header.GetRange (offset + ea->GetKeySize(), ea->GetKeySize()));
		}
		else
		{
			mode->SetKey (header.GetRange (offset, mode->GetKeySize()));
			ea->SetKey (header.GetRange (offset + LegacyEncryptionModeKeyAreaSize, ea->GetKeySize()));
		}

		ea->SetMode (mode);

		return true;
	}

	template <typename T>
	T VolumeHeader::DeserializeEntry (const ConstBufferPtr &header, size_t &offset) const
	{
		offset += sizeof (T);

		if (offset > header.Size())
			throw ParameterIncorrect (SRC_POS);

		return Endian::Big (*reinterpret_cast<const T *> (header.Get() + offset - sizeof (T)));
	}

	template <typename T>
	T VolumeHeader::DeserializeEntryAt (const ConstBufferPtr &header, const size_t &offset) const
	{
		if (offset > header.Size())
			throw ParameterIncorrect (SRC_POS);

		return Endian::Big (*reinterpret_cast<const T *> (header.Get() + offset));
	}

	void VolumeHeader::EncryptNew (const BufferPtr &newHeaderBuffer, const ConstBufferPtr &newSalt, const ConstBufferPtr &newHeaderKey, shared_ptr <Pkcs5Kdf> newPkcs5Kdf)
	{
		if (newHeaderBuffer.Size() != HeaderSize || newSalt.Size() != SaltSize)
			throw ParameterIncorrect (SRC_POS);

		shared_ptr <EncryptionMode> mode = EA->GetMode()->GetNew();
		shared_ptr <EncryptionAlgorithm> ea = EA->GetNew();

		if (typeid (*mode) == typeid (EncryptionModeXTS))
		{
			mode->SetKey (newHeaderKey.GetRange (EA->GetKeySize(), EA->GetKeySize()));
			ea->SetKey (newHeaderKey.GetRange (0, ea->GetKeySize()));
		}
		else
		{
			mode->SetKey (newHeaderKey.GetRange (0, mode->GetKeySize()));
			ea->SetKey (newHeaderKey.GetRange (LegacyEncryptionModeKeyAreaSize, ea->GetKeySize()));
		}

		ea->SetMode (mode);

		newHeaderBuffer.CopyFrom (newSalt);

		BufferPtr headerData = newHeaderBuffer.GetRange (EncryptedHeaderDataOffset, EncryptedHeaderDataSize);
		Serialize (headerData);
		ea->Encrypt (headerData);

		if (newPkcs5Kdf)
			Pkcs5 = newPkcs5Kdf;
	}

	size_t VolumeHeader::GetLargestSerializedKeySize ()
	{
		size_t largestKey = EncryptionAlgorithm::GetLargestKeySize (EncryptionAlgorithm::GetAvailableAlgorithms());

		// XTS mode requires the same key size as the encryption algorithm.
		// Legacy modes may require larger key than XTS.
		if (LegacyEncryptionModeKeyAreaSize + largestKey > largestKey * 2)
			return LegacyEncryptionModeKeyAreaSize + largestKey;

		return largestKey * 2;
	}

	void VolumeHeader::Serialize (const BufferPtr &header) const
	{
		if (header.Size() != EncryptedHeaderDataSize)
			throw ParameterIncorrect (SRC_POS);

		header.Zero();

		header[0] = 'V';
		header[1] = 'E';
		header[2] = 'R';
		header[3] = 'A';
		size_t offset = 4;

		header.GetRange (DataAreaKeyOffset, DataAreaKey.Size()).CopyFrom (DataAreaKey);

		uint16 headerVersion = CurrentHeaderVersion;
		SerializeEntry (headerVersion, header, offset);
		SerializeEntry (RequiredMinProgramVersion, header, offset);
		SerializeEntry (Crc32::ProcessBuffer (header.GetRange (DataAreaKeyOffset, DataKeyAreaMaxSize)), header, offset);

		uint64 reserved64 = 0;
		SerializeEntry (reserved64, header, offset);
		SerializeEntry (reserved64, header, offset);

		SerializeEntry (HiddenVolumeDataSize, header, offset);
		SerializeEntry (VolumeDataSize, header, offset);
		SerializeEntry (EncryptedAreaStart, header, offset);
		SerializeEntry (EncryptedAreaLength, header, offset);
		SerializeEntry (Flags, header, offset);

		if (SectorSize < TC_MIN_VOLUME_SECTOR_SIZE
			|| SectorSize > TC_MAX_VOLUME_SECTOR_SIZE
			|| SectorSize % ENCRYPTION_DATA_UNIT_SIZE != 0)
		{
			throw ParameterIncorrect (SRC_POS);
		}

		SerializeEntry (SectorSize, header, offset);

		offset = TC_HEADER_OFFSET_HEADER_CRC - TC_HEADER_OFFSET_MAGIC;
		SerializeEntry (Crc32::ProcessBuffer (header.GetRange (0, TC_HEADER_OFFSET_HEADER_CRC - TC_HEADER_OFFSET_MAGIC)), header, offset);
	}

	template <typename T>
	void VolumeHeader::SerializeEntry (const T &entry, const BufferPtr &header, size_t &offset) const
	{
		offset += sizeof (T);

		if (offset > header.Size())
			throw ParameterIncorrect (SRC_POS);

		*reinterpret_cast<T *> (header.Get() + offset - sizeof (T)) = Endian::Big (entry);
	}

	void VolumeHeader::SetSize (uint32 headerSize)
	{
		HeaderSize = headerSize;
		EncryptedHeaderDataSize = HeaderSize - EncryptedHeaderDataOffset;
	}
}